WO2017124783A1 - Motor, power device, and unmanned aerial vehicle using the power device - Google Patents

Abstract

A motor (100), a power device using the motor, and an unmanned aerial vehicle (500) using the power device. The motor (100) comprises a stator (30) and a rotor (50) rotatably sleeved around the stator (30). The motor (100) further comprises a heat dissipation member (34), accommodated in the stator (30) and connected to the stator (30) to stop rotation thereof. When the motor (100) is in operation, the rotor (50) causes surrounding air to flow, and the flowing air takes away heat generated by the motor (100). Therefore, the aerial vehicle (500) and the motor (100) thereof have high heat dissipation efficiency.

Description

Motor, power unit and unmanned aerial vehicle using the same Technical field

The present invention relates to an electric machine, a power unit using the same, and an unmanned aerial vehicle using the same.

Background technique

Brushless motors are widely used in mechatronics applications due to their low loss, low noise, smooth operation and long life. Generally, a brushless motor includes a base, a stator disposed on the base, a rotor disposed on the stator, and an outer cover coupled to the rotor. Generally, the outer cover is of an open structure having a large opening to facilitate heat dissipation of the motor, and heat generated by the operation of the motor is radiated into the air through the open cover. However, the above brushless motor has low heat dissipation efficiency, and it is easy to cause the motor magnet to fail due to high temperature.

Summary of the invention

In view of the above circumstances, it is necessary to provide a motor with high heat dissipation efficiency, and it is also necessary to provide a power unit using the motor and an unmanned aerial vehicle using the same.

An electric machine includes a stator and a rotor rotatably disposed outside the stator. The motor further includes a heat dissipating member received in the stator and connected to the stator; wherein when the motor is running, the rotor causes ambient air to flow, so that the flowing air is taken away The heat generated by the motor.

Further, the heat dissipating member is in the shape of a disk, and the heat dissipating member is installed in a central hole of the iron core of the stator, and the heat dissipating member includes a plurality of scattered radially distributed Hot department.

Further, the heat dissipating portion is at least one of a heat dissipating fin, a heat dissipating fin, and a heat dissipating cylinder;

Or/and, the heat dissipating member is provided with a heat dissipation hole for allowing air to flow, and the heat dissipation hole extends along a rotation axis of the motor.

Further, the heat dissipating member further includes an annular mounting portion, the mounting portion is fixed in a central hole of the iron core of the stator; the plurality of heat dissipating portions are located in the mounting portion, and from the The inner ring surface of the mounting portion extends.

Further, the heat dissipating portion is a heat dissipating blade, and the plurality of the heat dissipating blades are spaced apart from each other at an inner annular surface of the mounting portion.

Further, a plurality of the heat dissipating blades are parallel or coincident with an axis of rotation of the motor, such that a slit is formed between each of the two heat dissipating blades, the slits for allowing air to circulate;

Or/and the mounting portion is coaxially disposed with the stator, and the plurality of heat dissipating blades are disposed on an inner wall of the mounting portion, and the plurality of the heat dissipating blades are along a circumferential direction of the mounting portion Set in order.

Further, the motor further includes a cover body connected to the rotor, the cover body is provided with a wind hole for allowing air to circulate, and when the motor is running, the flowing air can be from the inside of the motor The vent is vented to remove heat generated by the motor.

Further, the cover body is provided with blades which can be rotated by the rotor to cause ambient air to flow.

Further, the cover body further includes a sidewall and a top wall, the sidewall is disposed at a periphery of the top wall and connected to the rotor, and the blade is disposed on the top wall, the wind hole Provided on at least one of the side wall and the top wall.

Further, the plurality of blades are a plurality of, and the plurality of the blades are radiated at intervals from each other Arranging on the top wall, forming a duct between each of the two blades; the wind hole is disposed on the side wall, each of the air passages corresponding to one of the air holes, and The wind holes are connected.

The cover further includes a retaining ring disposed on a side of the blade facing away from the top wall.

Further, one side of the baffle is connected to the blade, and a periphery of the baffle is connected to the side wall.

Further, the motor further includes a base, the stator is disposed on the base; the base is provided with a vent hole, and the vent hole communicates with the inner cavity of the rotor.

Further, the base includes a fixing portion and a ventilation portion, the stator is fixed on the fixing portion, the ventilation portion is circumferentially disposed on an outer circumference of the fixing portion, and the ventilation hole is disposed on the ventilation portion.

Further, the height of the stator is greater than or equal to 9 mm and less than or equal to 11 mm;

Or / and, the outer diameter of the stator is greater than or equal to 95 mm and less than or equal to 105 mm;

Or/and, the motor has a KV value of 120.

Further, the rotor includes a yoke and a plurality of magnets disposed in the yoke, the yoke cover is disposed outside the stator, and a plurality of the magnets are fixedly disposed on an inner wall of the yoke. And arranged along the circumferential interval of the yoke.

Further, the thickness or average thickness of each of the magnets along the diameter of the yoke is greater than or equal to 1.3 mm and less than or equal to 1.7 mm;

Or/and, the width or average width of each of the magnets in the circumferential direction of the yoke is 5.6 mm or more and 6.2 mm or less.

Further, the stator includes a core and a coil disposed on the core; the core includes a sleeve portion and a support portion disposed on the sleeve portion, and the coil is wound On the support portion.

Further, each of the support portions has a thickness or an average thickness of 2.3 mm or more and 2.9 mm or less;

Or/and the thickness of the support portion gradually increases from a side close to the sleeve portion to a side away from the sleeve portion.

Further, the diameter for removing the paint from the wire forming the coil is 0.30 mm or more and 0.90 mm or less.

Further, the coil is formed by winding a wire having a diameter of 0.9 mm after removing the patent leather;

Alternatively, the coil is formed by winding a wire having a diameter of 0.35 mm after removing the patent leather;

Alternatively, the coil is formed by winding three strands of wire having a diameter of 0.3 mm after removing the patent leather.

A power unit comprising a propeller, the power unit further comprising the electric machine according to any one of the above, the propeller being coupled to the motor, the motor being capable of driving the propeller to rotate.

Further, the torque coefficient of the propeller is greater than or equal to 1.32*10 ^-5 [Nm·m / (rev / min) ² ] and less than or equal to 1.92 * 10 ^-5 [Niu · m / (rev / min) ² ];

Or/and, the propeller is a folding paddle and includes two folding blades; each of the folding blades has a length greater than or equal to 295 mm and less than or equal to 355 mm; when the propeller 200 rotates, two The paddle blade forms a paddle diameter of greater than or equal to 640 mm and less than or equal to 760 mm.

An unmanned aerial vehicle includes an aircraft fuselage. The UAV further includes the power unit of any of the above, the motor being disposed on the aircraft fuselage to provide flight power to the UAV.

The motor of the unmanned aerial vehicle of the present invention includes a heat dissipating member connected to the stator, and the heat generated by the motor 100 is transmitted to the heat dissipating member due to the contact area between the heat dissipating member and the air. Relatively large, heat can be radiated into the air more quickly, so the heat dissipation efficiency of the motor is higher.

DRAWINGS

1 is a perspective view of an unmanned aerial vehicle according to an embodiment of the present invention.

2 is an assembled perspective view of the motor of the unmanned aerial vehicle of FIG. 1.

Figure 3 is an exploded perspective view of the motor of Figure 2.

4 is an exploded perspective view of the motor of FIG. 2 from another perspective.

Fig. 5 is a perspective view showing a part of the structure of the motor shown in Fig. 2.

Figure 6 is a partial schematic view of a cross section of the motor of Figure 4.

Fig. 7 is a perspective view showing the cover body and the rotor of the motor shown in Fig. 2.

Main component symbol description

Motor	100
Pedestal	10
Fixed part	12
Ventilation department	14
Vent	141
stator	30
Iron core	32
Set up department	321
Support	323
Stop	325
Heat sink	34

Installation department	341
Heat sink	343
Slit	3431
Rotor	50
Yoke	52
magnet	54
Cover	70
Top wall	72
Positioning hole	721
Side wall	74
Wind hole	741
blade	76
Rotating shaft	90
propeller	200
Unmanned aerial vehicle	500
Aircraft fuselage	510

The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or the component can be present. When a component is recognized To "connect" another component, it can be directly connected to another component or possibly a centered component. When a component is considered to be "set to" another component, it can be placed directly on another component or possibly with a centered component. The terms "vertical," "horizontal," "left," "right," and the like, as used herein, are for illustrative purposes only.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

In the process of implementing the present invention, the inventors have found the following problems:

(1) The heat dissipation efficiency of the motor is mainly affected by the heat dissipation of the stator of the motor. For this reason, the inventor mainly improves the heat dissipation of the stator of the motor.

(2) The heat dissipation of the stator of the motor is related to the direction of heat dissipation. For this reason, the inventor uses a heat sink and designs the heat dissipation direction of the heat sink.

(3) the efficiency of the motor and the height of the stator, the outer diameter of the stator, the thickness or average thickness of the magnet of the rotor in the diametrical direction of the yoke, the width or average width of the magnet along the circumferential direction of the yoke, and the stator The thickness or average thickness of the support for winding the coil is related, and for this reason, the inventors have made improvements.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The features of the embodiments and examples described below can be combined with each other without conflict.

Referring to Fig. 1, an unmanned aerial vehicle 500 according to an embodiment of the present invention is used for mounting an electronic device (not shown) such as a camera or a camera for photographing. The UAV 500 includes an aircraft fuselage 510 and a power unit (not shown) disposed on the aircraft fuselage 510. The power unit includes a motor 100 and a propeller 200 disposed on the motor 100. The motor 100 is used to drive the propeller 200 turns Moving, thereby driving the UAV 500 to fly. The motor 100 may be plural, and a plurality of the motors 100 are respectively disposed on the aircraft body 510.

Referring to FIG. 2 to FIG. 4 simultaneously, in the embodiment, the motor 100 is a brushless motor, and includes a base 10, a stator 30, a rotor 50, a cover 70, and a rotating shaft 90. Specifically, in the illustrated embodiment, the stator 30 is fixedly disposed on the base 10, the rotor 50 is rotatably coupled to the base 10, and the cover 70 is disposed on the rotor. The rotating shaft 90 is disposed on the cover 70.

The base 10 includes a fixing portion 12 and a ventilation portion 14 formed on the fixing portion 12.

The fixing portion 12 is substantially disk-shaped for mounting and fixing the stator 30.

In the present embodiment, the ventilation portion 14 is substantially annular and is provided on the outer circumference of the fixing portion 12 . The venting portion 14 is provided with a plurality of vent holes 141 that penetrate the venting portion 14 and communicate with the inner cavity of the motor 100. The venting holes 141 are used to allow air to circulate to allow the flowing air to carry away heat generated inside the motor 100 due to work.

Since the ventilating portion 14 is substantially annular and located on the outer circumference of the fixed portion 12, it corresponds to the iron core 32 of the stator 30, thereby accelerating the heat dissipation efficiency of the iron core of the iron core 32 of the stator 30.

Referring to FIG. 5 at the same time, the stator 30 is disposed on the fixing portion 12, and includes a core 32 and a coil (not shown). The coil is wound around the core 32.

The iron core 32 includes a sleeve portion 321 and a support portion 323 disposed on the sleeve portion 321 .

The sleeve portion 321 has a substantially cylindrical shape and is disposed on the fixing portion 12 and is connected to the fixing portion 12 in a rotationally fixed manner. In the present embodiment, the height h of the sleeve portion 321 in the axial direction thereof is 9 mm or more and 11 mm or less. The height h of the sleeve portion 321 may be any value between 9 mm and 11 mm. For example, the height h of the sleeve portion 321 may be 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, ...or any value within the range of values defined by any two of the above values.

The support portion 323 may be plural, and the plurality of the support portions 323 are disposed outside the sleeve portion 321 and are arranged along the circumferential direction of the sleeve portion 321 . Each of the supporting portions 323 is substantially in the shape of a plate, and one side thereof is fixed to the outer circumference of the sleeve portion 321 , and the other side is directed away from the sleeve portion 321 along the radial direction of the sleeve portion 321 . extend.

Referring to FIG. 6 , in particular, in the illustrated embodiment, the thickness of the support portion 323 gradually increases from a side close to the sleeve portion 321 to a side away from the sleeve portion 321 . In the present embodiment, the support portion 323 has an average thickness t of 2.3 mm or more and 2.9 mm or less. The average thickness t of the support portion 323 may be any value between 2.3 mm and 2.9 mm, such as 2.3 mm, 2.35 mm, 2.5 mm, 2.55 mm, 2.6 mm, 2.65 mm, 2.7 mm, 2.75 mm, 2.9 mm, ...or any value within the range of values defined by any two of the above values.

It can be understood that the support portion 323 may have a rectangular plate shape, and the thickness t thereof is equal from a side close to the sleeve portion 321 to a side away from the sleeve portion 321 , and the support portion 323 is The thickness t is greater than or equal to 2.3 mm and less than or equal to 2.9 mm. The thickness t of the support portion 323 may be any value between 2.3 mm and 2.9 mm, such as 2.3 mm, 2.35 mm, 2.5 mm, 2.55 mm, 2.6 mm, 2.65 mm, 2.7 mm, 2.75 mm, 2.9 mm,... ...or any value within the range of values defined by any two of the above values.

It can be understood that the number of the supporting portions 323 may be plural, for example, five, six, seven, eight, ten, eleven, and the like.

The support portion 323 is for supporting the coil (not shown). The coil may be plural, and each of the coils is wound around one of the support portions 323. The diameter for removing the paint from the wire forming the coil is 0.30 mm or more and 0.90 mm or less, and the number of turns is 13 大于 or more and 20 小于 or less. Specifically, in the present embodiment, the coil is formed by winding a wire having a diameter of 0.9 mm after removing the patent leather. It can be understood that in other embodiments, the coil can be formed by winding a corresponding number of turns of other specifications of the wire under the condition that the groove full rate is similar to the above-described winding method. For example, the diameter of the wire after removing the patent leather may be 0.31 mm, 0.5 mm, etc., the coil may be formed by winding a wire having a diameter of 0.35 mm after removing the patent leather, or the coil may be wound by a wire of other specifications. It is formed by setting the corresponding number of turns. It will be appreciated that the coil may be formed as a plurality of strands of wire, for example, the coil may be formed by winding 30 turns of two wires having a diameter of 0.3 mm.

Further, each of the support portions 323 forms a stop portion 325 away from the end of the sleeve portion 321 . The size of each of the stopping portions 325 is larger than the thickness dimension of the corresponding end of the supporting portion 323 to prevent the corresponding coil (not shown) from being detached from the corresponding supporting portion 323, and the iron is facilitated. The magnetic permeability of the core 32. The surface of the stopping portion 325 facing away from the corresponding supporting portion 323 is a partial cylindrical surface.

The stopper portion 325, the support portion 323, the sleeve portion 321 and the stator 30 formed by the coil are substantially cylindrical.

The cylindrical stator 30 has an outer diameter D of 95 mm or more and 105 mm or less. The outer diameter D of the stator 30 may be any value between 95 mm and 105 mm. For example, the outer diameter D of the stator 30 may be 95 mm, 98 mm, 99 mm, 100 mm, 101 mm, 102 mm. , 105 mm, ... or any value within the range of values defined by any two of the above values.

The height H of the cylindrical stator 30 along its axial direction is greater than or equal to 9 mm. And less than or equal to 11 mm. The height H of the stator may be any value between 9 mm and 11 mm. For example, the height H of the stator 30 may be 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, ... or the above Any value within the range of values defined by any two values. In this embodiment, the axial height H of the stator 30 is the axial height h of the sleeve portion 321; it can be understood that the maximum axial height of the stator 30 may be greater or smaller than the sleeve portion 321 The axial height h, that is, the end of the sleeve portion 321 may be convex or concave with respect to the end of the stator 30.

In order to speed up the heat dissipation of the motor 100, the motor 100 further includes a heat sink 34 that is non-rotatably coupled to the stator 30. Specifically, the heat sink 34 is received in the central through hole of the sleeve portion 321 and fixedly connected to the fixing portion 12 of the base 10 . Since the heat sink 34 is received in the central hole of the sleeve portion 321 to increase the contact area between the heat sink 34 and the core 32 of the stator 30, the heat dissipation efficiency is improved, and the volume of the entire motor is avoided, which facilitates the miniaturization of the motor.

In the present embodiment, the heat sink 34 has a substantially disk shape. The mounting portion 341 and the heat radiating portion 343 are included. In the present embodiment, the mounting portion 341 is substantially annular, and is disposed substantially coaxially with the sleeve portion 321 . The heat radiating portion 343 is substantially in the form of a sheet. The heat radiating portion 343 is disposed inside the mounting portion 341 and extends substantially in the radial direction of the heat radiating portion 343. Since the heat radiating portion 343 extends in the radial direction of the heat radiating portion 343, the heat of the iron core 32 guiding the stator 30 is concentrated from the outer portion toward the middle portion, and is carried away by the axial airflow of the motor, thereby improving the heat dissipation efficiency of the motor.

In the present embodiment, the number of the heat radiating portions 343 is plural, and the plurality of heat radiating portions 343 are sequentially disposed at intervals in the circumferential direction of the mounting portion 341. A plurality of the heat dissipating portions 343 are located in the mounting portion 341 and extend from the inner annular surface of the mounting portion 341. The plurality of fin-shaped heat dissipating portions 343 form a radially distributed rib-type heat dissipating structure, and the plurality of heat dissipating portions 343 are parallel or coincident with the rotation axis of the motor 100, A slit 3431 is formed between each of the two adjacent heat radiating portions 343, and the direction of the slits 3431 is extended substantially in the axial direction of the motor 100. The slit 3431 facilitates the circulation of air, so that the flowing air takes away the heat of the heat dissipating portion 343, thereby facilitating heat dissipation of the motor 100.

The rotor 50 is disposed on an outer circumference of the iron core 32 and includes a yoke 52 and a magnet 54 disposed on the yoke 52.

The yoke 52 has a substantially cylindrical shape and is rotatably covered on the outer circumference of the core 32.

The magnets 54 may be plural, and a plurality of the magnets 54 are fixedly disposed inside the yoke 52 and arranged along the circumferential direction of the yoke 52. Specifically, in the illustrated embodiment, each of the magnets 54 is substantially in the shape of an arc having a thickness T or an average thickness T along the diameter direction of the yoke 52 of 1.3 mm or more and 1.7 mm or less. The thickness T or the average thickness of the magnet 54 may be any value between 1.3 mm and 1.7 mm, for example, the thickness T or the average thickness T of the magnet 54 may be 1 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, ... or any value within the range of values defined by any two of the above values.

The width b or the average width b of the magnet 54 in the circumferential direction of the yoke 52 is 5.6 mm or more and 6.2 mm or less. The width b or the average width b of the magnet 54 may be any value between 5.6 mm and 6.2 mm, for example, the width b or the average width b of the magnet 54 may be 5.6 mm, 5.7 mm, 5.7 mm, 5.9 mm. , 5.95 mm, 6.0 mm, 6.02 mm, 6.03 mm, 6.08 mm, 6.1 mm, 6.3 mm, ... or any value within the range of values defined by any two of the above values.

It can be understood that the magnet 54 can be in the shape of a rectangular plate. The thickness T of the magnets 54 along the diametrical direction of the yoke 52 may be equal everywhere, and the width b along the circumferential direction of the yoke 52 may be equal everywhere.

It can be understood that the number of the magnets 54 may be plural, for example, seven, eight, nine, ten, twelve, thirteen, fourteen, ... and the like.

Referring to FIG. 7 simultaneously, the cover 70 is coupled to the yoke 52 for mounting the propeller 200. The cover 70 includes a top wall 72, side walls 74, and vanes 76. Specifically in the illustrated embodiment, the side walls 74 and the vanes 76 are each disposed on the top wall 72.

The top wall 72 has a substantially circular plate shape, and a plurality of positioning holes 721 are formed therethrough. A plurality of the positioning holes 721 are spaced apart from each other for fixed positioning of the propeller 200 of the UAV 500.

Referring to FIG. 4 again, in the present embodiment, the side wall 74 is substantially cylindrical and is formed around the outer edge of the top wall 72 and is substantially perpendicular to the top wall 72 and faces the yoke 52. extend. A plurality of wind holes 741 are formed in the side wall 74. In the present embodiment, the air hole 741 extends through the side wall 74 and extends substantially in the radial direction of the cover body 70 until it communicates with the inner cavity of the motor 100. In the present embodiment, the number of the air holes 741 is plural, and the plurality of the air holes 741 are arranged along the circumferential direction of the side walls 74 and are spaced apart from each other. The air hole 741 is used to allow air to circulate, thereby facilitating heat dissipation of the motor 100. The extending direction of the air hole 741 is substantially perpendicular to the extending direction of the slits 3431 formed by the plurality of heat radiating portions 343, so that the flow direction of the air passing through the air holes 741 is substantially perpendicular to the corresponding The flow direction of the air of the slit 3431.

A plurality of the vanes 76 are disposed on a side of the top wall 72 facing the yoke 52. In the present embodiment, the vane 76 is a centrifugal fan blade. A plurality of the vanes 76 are spaced apart from each other on the top wall 72 and are arranged substantially in a radial shape. Two adjacent sides of each of the vanes 76 are coupled to the top wall 72 and the side walls 74, respectively. A duct 761 is formed between each of the two blades 76, and each of the ducts 761 corresponds to one of the air holes 741 and communicates with the air holes 741. When the rotor 50 drives When the cover 70 is rotated relative to the stator 30, the blades 76 simultaneously perform a rotational motion to accelerate the air flow velocity around the blades 70 to improve the heat dissipation efficiency of the motor 100.

In order to further improve the heat dissipation efficiency of the motor 100, the cover 70 further includes a retaining ring 78. The retaining ring 78 is disposed in the cover body 70 and is disposed at one end of the air duct 761 to form a ventilation duct at the connection between the air duct 761 and the air hole 741 to guide the air. The flow direction and the effect of accelerating the air flow speed while collecting the wind increase the heat dissipation efficiency of the motor 100. In particular, in the illustrated embodiment, the retaining ring 78 is generally annular in shape that overlaps the vane 76 and is disposed generally parallel to the top wall 72. The retaining ring 78 is coupled to the vane 76, and a peripheral edge of the retaining ring 78 is coupled to the sidewall 74. In the present embodiment, the retaining ring 78 is integrally formed with the vane 76 and the side wall 74. It can be understood that in other embodiments, the retaining ring 78 can be assembled with the vane 76 and the side wall 74.

Referring to FIG. 2 to FIG. 4 again, the rotating shaft 90 is substantially cylindrical and has one end inserted at a substantially central position of the top wall 72 of the cover 70 and connected to the top wall 72. The rotating shaft is connected. The other end of the 90 is rotatably inserted into the fixing portion 12 of the base 10. When the motor 100 is energized, the rotor 50 drives the cover 70 and the rotating shaft 90 to rotate relative to the stator 30 and the base 10. Further, the end of the rotating shaft 90 protrudes from the surface of the top wall 72 of the cover body 70 for mounting the propeller 200 and driving the propeller 200 to rotate. It can be understood that the rotating shaft 90 can be not limited to the above-mentioned arrangement. For example, one end of the rotating shaft 90 can be inserted into the fixing portion 12 of the base 10 and connected to the fixing portion 12, and the other end can be Rotatingly passing through the top wall 72 of the cover body 70, the rotor 50, the cover body 70 and the propeller 200 are rotatable relative to the stator 30 and the base 10 about the axis of the rotating shaft 90. Just fine.

Referring again to FIG. 1, in the present embodiment, the number of the propellers 200 is A plurality of each of the propellers 200 are mounted on one of the motors 100 to collectively form a power unit to provide flight power to the unmanned aerial vehicle 500.

When the motor 100 of the present embodiment is assembled, first, the coil is wound around the core 32, the core 32 is fixedly disposed on the fixing portion 12, and the heat sink 34 is received. The iron core 32 is connected to the fixing portion 12 . Then, the magnet 54 is mounted on the yoke 52, the yoke 52 is fixedly connected to the cover 70, and one end of the rotating shaft 90 is inserted on the top of the cover 70. On the wall 72. Finally, one end of the rotating shaft 90 away from the cover body 70 is rotatably inserted into the fixing portion 12, and the yoke 52 is rotatably disposed on the outer circumference of the stator 30. At this time, the vent hole 141 on the susceptor 10 communicates with a cavity (not shown) inside the yoke 52, and passes through a slit 3431 between the plurality of heat radiating portions 343. The air hole 741 and the air duct 761 on the cover 70 are in communication with each other. Thus, an air flow passage (not shown) is formed between the cover 70, the yoke 52 and the base 10 to allow air to circulate to remove heat generated when the motor 100 operates.

When the motor 100 is in operation, the cover 70 and the rotor 50 rotate relative to the stator 30 and the base 10, and the blades 76 of the cover 70 disturb the surrounding air due to rotation, and accelerate The flow of the surrounding air enters the yoke 52 and the core 32 through the vent hole 141, and is discharged through the air passage 761 and the air hole 741, thereby taking the motor 100 away. The heat generated during operation.

Further, in the present embodiment, the motor has a KV value of 120.

Please refer to Table 1. Table 1 shows the torque and motor efficiency of the motor using the new motor provided at different stator heights, different stator outer diameters, different magnet widths and different support thicknesses. And the change of the motor speed. In the present embodiment, the coil of the motor is formed by winding a wire having a diameter of 0.9 mm after removing the patent leather, and the wiring is a delta connection. It will be appreciated that the coils may also be of other types of wiring, such as a Y-connection or a star connection.

As can be seen from Table 1, the operating efficiency of the motor of the third embodiment is relatively high, reaching 82.3% or more.

An electric machine according to an embodiment of the present invention is applied to a propeller 200 of the unmanned aerial vehicle 500, and the propeller 200 is fixedly mounted at one end of a rotating shaft of the motor. When the motor is energized, the rotor of the motor drives the propeller 200 to rotate through the rotating shaft, thereby driving the UAV 500 to fly. Preferably, the torque coefficient of the propeller 200 is greater than or equal to 1.32*10 ^-5 [Nm·m / (rev / min) ² ] and less than or equal to 1.92 * 10 ^-5 [Nm · m / (rev / min) ² ]. Wherein, the torque coefficient of the propeller 200 is:

Torque factor = torque / (speed ² )

Further, the propeller 200 is a folding propeller, and when the UAV 500 is not in operation, the two folding blades of the propeller 200 can be rotated to overlap with the motor 100. In the present embodiment, the length of each of the folding blades is greater than or equal to 295 mm and less than or equal to 355 mm. When the propeller 200 rotates, the two sheets of the folding blades form a paddle diameter greater than or equal to 640 mm and less than or equal to 760 mm.

In summary, the motor of the embodiment of the present invention optimizes the height and outer diameter of the stator, optimizes the width of the magnet, and the thickness of the support portion, so that the motor is applied to the In the case of the propeller, it is possible to have a high operating efficiency and a high efficiency, and therefore, the dynamic performance of the motor is good.

Further, the motor 100 is required to be equipped with an electronic governor (not shown) to allow the electronic governor to control the operating speed of the motor 100. The electronic governor is fixed on the base 10, and the motor 100 runs while dissipating heat. The electronic governor is also cooled.

The motor 100 of the UAV 500 of the present invention has a vent hole 141 formed in the base 10 thereof, and the side wall 74 of the cover 70 defines the air hole 741 and the air duct 761 to make the cover body 70. An air flow channel is formed between the yoke 52 and the base 10. When the motor 100 is in operation, the vane 76 of the cover 70 accelerates air flow due to rotation, and the flowing air picks up heat generated by the motor 100 during operation through the air flow passage, thereby improving the motor. 100 overall heat dissipation efficiency. At the same time, the retaining ring 78 is disposed on the air duct 761, so that a joint of the air duct 761 and the air hole 741 forms a ventilation duct to guide the flow direction of the air to gather the wind. The action speeds up the air flow speed, further improving the heat dissipation efficiency of the motor 100.

Further, the heat dissipating member 34 includes a heat dissipating portion 343, and the heat dissipating portion 343 is a ribbed structure. When the heat generated when the motor 100 is operated is conducted to the heat dissipating portion 343, the heat dissipating portion 343 is formed. The contact area with air is relatively large, allowing heat to be radiated into the air more quickly. Moreover, the flowing air can also quickly carry away the heat conducted to the heat radiating portion 343. In addition, the top wall 72 of the cover body 70 of the motor 100 is substantially plate-shaped, and only the side wall 74 is opened to allow air to circulate the air hole 741, so that the cover body 70 is provided. The substantially closed cover body ensures the dustproof effect of the motor 100, so that impurities such as dust in the air are not easily directly entered into the motor 100, thereby making the motor 100 run more smoothly. The ventilation structure composed of the plurality of air ducts 761 and the air holes 741 further improves the dustproof effect of the motor 100 without affecting air circulation and heat dissipation.

It can be understood that the air hole 741 on the side wall 74 can also be opened on the top wall 72 of the cover 70, or a plurality of the air holes 741 can be respectively opened on the top wall 72 and the Said on the side wall 74. Therefore, the ventilation structure composed of the plurality of air ducts 761 and the air hole 741 can ensure the heat dissipation effect of the motor 100 while ensuring The dustproof effect of the motor 100 is demonstrated.

It can be understood that the shape of the wind hole 741 is not limited to the hole structure described above, and may be designed as a multi-ring structure, a rectangular structure, a grid structure or other irregular pattern structure or the like to allow the cover. The body 70 has a dustproof effect and does not affect the air flow and heat dissipation.

It can be understood that the structure of the heat dissipating portion 343 of the heat dissipating member 34 is not limited to the ribbed heat dissipating structure described above, and it can be designed as another heat dissipating structure. For example, the heat dissipation portion 343 may be a columnar heat dissipation end. Specifically, the heat dissipating member 34 may include the mounting portion 341 and a heat dissipating end protrudingly formed on the mounting portion 341 , and the mounting portion 341 is disposed on the fixing portion 12 . Alternatively, in some other embodiments, the heat dissipation end may be a heat dissipation fin formed by the surface of the mounting portion 341, a heat dissipation blade, a heat dissipation cylinder, or other similar heat dissipation structure to increase the The contact area of the heat sink 34 with the air further improves the heat dissipation efficiency.

Similarly, the structure of the mounting portion 341 of the heat sink 34 is not limited to the above-described annular structure, and may be other structures such as a plate shape, a column shape, and the like, and is housed in the stator 30. And used to carry the heat dissipation portion 343. Further, the mounting portion 341 can be provided with a plurality of heat dissipation holes for allowing air to flow, so that the ventilation holes 141 of the base 10 can pass through the plurality of heat dissipation holes and the air passage 761. In connection, the direction of the heat dissipation holes extends substantially along the axial direction of the motor 100. Of course, these heat dissipation holes can also be disposed on the heat dissipation portion 343 at the same time.

In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

Claims (24)

1. An electric motor comprising a stator and a rotor rotatably disposed outside the stator, wherein the motor further comprises a heat dissipating member, the heat dissipating member being received in the stator and stopping with the stator Turning the connection; when the motor is running, the rotor causes ambient air to flow, causing the flowing air to carry away the heat generated by the motor.
2. A motor according to claim 1, wherein said heat dissipating member is in the shape of a disk, and said heat dissipating member is mounted in a center hole of said iron core of said stator, said heat dissipating member comprising a radially distributed portion Multiple heat sinks.
3. The motor according to claim 2, wherein the heat dissipating portion is at least one of a heat dissipating fin, a heat dissipating fin, and a heat dissipating cylinder;

   Or/and, the heat dissipating member is provided with a heat dissipation hole for allowing air to flow, and the heat dissipation hole extends along a rotation axis of the motor.
4. The motor according to claim 2, wherein said heat dissipating member further comprises an annular mounting portion, said mounting portion being fixed in a central hole of said iron core of said stator; said plurality of heat dissipating portions being located The inside of the mounting portion extends from an inner annular surface of the mounting portion.
5. The motor according to claim 4, wherein said heat dissipating portion is a heat dissipating blade, and said plurality of heat dissipating blades are spaced apart from each other at an inner annular surface of said mounting portion.
6. The motor according to claim 5, wherein a plurality of said heat dissipating blades are parallel or coincident with an axis of rotation of said motor to form a slit between each of said two heat dissipating blades, said slit being used for Allow air circulation;

   Or/and the mounting portion is coaxially disposed with the stator, and the plurality of heat dissipating blades are disposed on an inner wall of the mounting portion, and the plurality of the heat dissipating blades are along a circumferential direction of the mounting portion Set in order.
7. The motor of claim 1 wherein said motor is further The utility model comprises a cover body connected to the rotor, the cover body is provided with a wind hole for allowing air to flow, and when the motor is in operation, the flowing air can be discharged from the air hole from the inside of the motor Take away the heat generated by the motor.
8. The motor according to claim 7, wherein said cover body is provided with a blade which is rotatable by said rotor to cause a flow of ambient air.
9. The motor according to claim 8, wherein said cover further comprises a side wall and a top wall, said side wall being disposed at a periphery of said top wall and connected to said rotor, said blade being disposed at The wind hole is disposed on the top wall on at least one of the side wall and the top wall.
10. The motor according to claim 9, wherein said plurality of blades are plural, and said plurality of said blades are radially arranged on said top wall at intervals, and a duct is formed between each of said two blades. The air holes are disposed on the side walls, and each of the air passages corresponds to one of the air holes and communicates with the air holes.
11. The motor of claim 9 wherein said cover further comprises a retaining ring disposed on a side of said vane facing away from said top wall.
12. The motor according to claim 11, wherein one side of said retaining ring is coupled to said vane, and a periphery of said retaining ring is coupled to said side wall.
13. A motor according to claim 1, wherein said motor further comprises a base, said stator being disposed on said base; said base being provided with a vent hole, said vent hole and said rotor The lumens are connected.
14. The motor according to claim 13, wherein the base includes a fixing portion and a venting portion, the stator is fixed to the fixing portion, and the venting portion is circumferentially disposed on an outer circumference of the fixing portion, A vent is provided on the vent.
15. The motor of claim 1 wherein: said stator The height is greater than or equal to 9 mm and less than or equal to 11 mm;

    Or / and, the outer diameter of the stator is greater than or equal to 95 mm and less than or equal to 105 mm;

    Or/and, the motor has a KV value of 120.
16. The motor according to claim 1, wherein said rotor comprises a yoke and a plurality of magnets disposed in said yoke, said yoke cover being disposed outside said stator, and said plurality of said magnets being fixed They are disposed on the inner wall of the yoke and arranged along the circumferential interval of the yoke.
17. The motor according to claim 16, wherein each of said magnets has a thickness or an average thickness in the diametrical direction of said yoke of 1.3 mm or more and 1.7 mm or less;

    Or/and, the width or average width of each of the magnets in the circumferential direction of the yoke is 5.6 mm or more and 6.2 mm or less.
18. The motor according to claim 1, wherein the stator comprises a core and a coil disposed on the core; the core comprises a sleeve portion and a support portion disposed on the sleeve portion The coil is wound around the support portion.
19. The motor according to claim 18, wherein each of said support portions has a thickness or an average thickness of 2.3 mm or more and 2.9 mm or less;

    Or/and the thickness of the support portion gradually increases from a side close to the sleeve portion to a side away from the sleeve portion.
20. The motor according to claim 18, wherein the wire for winding the wire forming the coil has a diameter of 0.30 mm or more and 0.90 mm or less.
21. The motor according to claim 18, wherein said coil is formed by winding a wire having a diameter of 0.9 mm after removing the patent leather;

    Alternatively, the coil is wound by a wire having a diameter of 0.35 mm after removing the patent leather. Set 15 匝 formation;

    Alternatively, the coil is formed by winding three strands of wire having a diameter of 0.3 mm after removing the patent leather.
22. A power unit comprising a propeller, characterized in that the power unit further comprises the electric machine according to any one of claims 1 to 21, the propeller being coupled to the motor, the motor being capable of driving the propeller Turn.
23. A power unit according to claim 22, wherein said propeller has a torque coefficient greater than or equal to 1.32*10 ^-5 [Nm·m / (rev / min) ² ] and less than or equal to 1.92 * 10 ^-5 [牛· m / (rev / min) ² ];

    Or/and, the propeller is a folding paddle, and includes two folding blades; each of the folding blades has a length of 295 mm or more and 355 mm or less; when the propeller rotates, two pieces of the The paddles formed by the folding blades have a diameter of 640 mm or more and 760 mm or less.
24. An unmanned aerial vehicle comprising an aircraft fuselage, characterized in that the aircraft further comprises the power unit according to any one of claims 22 to 23, wherein the motor is disposed on the aircraft fuselage The unmanned aerial vehicle provides flight power.

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